Abstract: Indigenous language bilingual schooling, introduced in Australia's Northern Territory (NT) in 1973, was a reality for over twenty-five schools at the program's height. Today, the language-of-instruction in these same settings is English only, with only 7 state schools operating bilingual programs. Overt Government hostility began with an attempt to defund Indigenous bilingual education in 1998-99. This paper argues that the discursive techniques used to justify these cuts were crucial to developing key themes in 'mainstreaming discourses' in Indigenous politics, which has rehabilitated assimilationist thinking in a neoliberal context through the 2000s and since. Using a discourse-historical method, this paper elucidates how mainstreaming discourses were constructed against bilingual education in the 1998?99 debate, and how they emphasized English-only education geared towards neoliberal assimilation for remote Indigenous communities. Indigenous bilingual education was conceived as part of 'failed' self-determination in remote Australia. This paper enhances understanding of the patterns and themes of mainstreaming discourses by tracing their genealogical development in this debate.